<template>
    <div class="tags" v-if="showTags">
        <ul>
            <li class="tags-li" v-for="item,index in tagsList" :class="{'active':isActive(item.path)}" :key="index">
                <router-link :to="item.path" class="tags-li-title " >
                    {{item.title}}
                </router-link>
                <span class="tags-li-icon" @click="closeTags(index)"><i class="el-icon-close"></i></span>
            </li>
        </ul>
        
        <div class="tags-close-box">
            <el-dropdown @command="handleTags">
                <el-button size="mini" type="primary">
                    标签选项<i class="el-icon-arrow-down el-icon--right"></i>
                </el-button>
                <el-dropdown-menu size="small" slot="dropdown">
                    <el-dropdown-item command="other">关闭其他</el-dropdown-item>
                    <el-dropdown-item command="all">关闭所有</el-dropdown-item>
                </el-dropdown-menu>
            </el-dropdown>
        </div>
    </div>
</template>

<script>
    import Bus from 'common/js/bus'
    export default {
        name: "tagsList",
        data(){
          return {
              tagsList:[]
          }
        },
        computed:{
            showTags(){
                return this.tagsList.length>0;
            },

        },
        created(){
            this.setTags(this.$route);
        },
        methods:{
            isActive(path){
                return this.$route.fullPath === path;
            },
            handleTags(command){
                command === 'other' ? this.closeOther() : this.closeAll();
            },
            closeOther(){
                const curItem = this.tagsList.filter(item=>{
                    return item.path === this.$route.fullPath;
                });
                this.tagsList = curItem;
            },
            closeAll(){
              this.tagsList = [];
              this.$router.push('/');
              console.log(123);
            },
            closeTags(index){
               const delItem =  this.tagsList.splice(index,1)[0];
               const item = this.tagsList[index] ? this.tagsList[index] : this.tagsList[index-1];
               if(item){
                   delItem.path === this.$route.fullPath && this.$router.push(item.path);
               }else{
                   this.$router.push('/');
               }
            },
            setTags(route){
                const isExist = this.tagsList.some(item=>{
                    return item.path === route.fullPath;
                });
                if(!isExist){
                    if(this.tagsList.length>=8){
                        this.tagsList.shift();
                    }
                    this.tagsList.push({
                        title:route.meta.title,
                        path:route.fullPath,
                        name:route.matched[1].components.default.name
                    })
                }
                Bus.$emit('tags', this.tagsList);
            }
        },
        watch:{
            $route(newVal,oldVal){
                this.setTags(newVal);
            }
        }
    }
</script>

<style scoped lang="scss">
    .tags{
        position: relative;
        height: 30px;
        overflow: hidden;
        background: #ffffff;
        padding-right: 120px;
        -webkit-box-shadow: 0 5px 10px #dddddd;
        -moz-box-shadow: 0 5px 10px #dddddd ;
        box-shadow: 0 5px 10px #dddddd ;
        padding-left: 10px;
    }
    .tags-li{
        float: left;
        margin: 3px 5px 3px 3px;
        border-radius:3px;
        font-size: 12px;
        overflow: hidden;
        cursor: pointer;
        height: 22px;
        line-height: 22px;
        border: 1px solid #e9eaec;
        background-color: #ffffff;
        padding: 0 5px 0 12px;
        color: #666666;
        transition:all 0.3s ease-in;
    }
    .tags-li.active{
        border: 1px solid #409EFF;
        background-color: #409EFF;
        color: #ffffff;
        .tags-li-title{
            color: #fff;
        }
    }
    .tags-li:not(.active):hover{
        background: #f8f8f8;
    }
    .tags-close-box{
        position: absolute;
        right: 0;
        top: 0;
        box-sizing: border-box;
        padding-top: 1px;
        text-align: center;
        width: 110px;
        height: 30px;
        background: #fff;
        box-shadow: -3px 0 15px 3px rgba(0, 0, 0, .1);
        z-index: 10;
    }
</style>